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Well there aren't too many options, do you want rectilinear or fisheye? What is your budget?

The only ones I can think of are:Canon 15mm f/2.8 fisheye (Discontinued, but you can still find them used for around $500)Sigma 15mm f/2.8 fisheye (I've heard nothing but great things, around $600)Zeiss 15mm f/2.8 (amazing lens, but $3000)Canon 8-15mm f/4L fisheye ($1300 or so, again a great lens)

ZnarF

You should consider the Samyang 14mm f2.8 (also sold under Walimex and other brands).It's manual focus, but i think at 14mm thats no big issue. it is razor sharp! My only nit is the rather strong vignetting. An amazing lens for just 300€.

ChilledXpress

I absolutely love the Sigma 15mm... I own over 15 "L" lenses but the Siggy 15mm is one of my very faves. I bought every UWA fish available when deciding which to go with; Canon, Siggy, Samyang/Rokinon , etc... tested them all, kept the Siggy. I wanted to love the 8-15L but the Sig was soooo much sharper. I'd say it focuses at about the same rate as the Canon. Depending on what show up at the door will determine how much you'll love the Samyang, out of 3 copies only one was worth looking at. Besides... the Siggy still auto focuses and "works" well with the 5D3. When my son was about to be delivered, I looked at all the lenses I owned, then took the 15mm into the delivery room. Love it that much!!!!

I absolutely love the Sigma 15mm... I own over 15 "L" lenses but the Siggy 15mm is one of my very faves. I bought every UWA fish available when deciding which to go with; Canon, Siggy, Samyang/Rokinon , etc... tested them all, kept the Siggy. I wanted to love the 8-15L but the Sig was soooo much sharper. Depending on what show up at the door depends how much you'll love the Samyang, out of 3 copies only one was worth looking at. Besides the Siggy still auto focuses and "works" well with the 5D3. When my son was about to be delivered, I looked at all the lenses I owned, then took the 15mm into the delivery room. Love it that much!!!!

A just returned a new Sigma 15. Corners too soft at any aperture, strong vignetting even at f/11, one stop overexposure on my 5DII. I replaced it with a used Canon 15 - much better. Side by side, the Canon wins easily. Aside from the corners, they are both very sharp.

I was going to keep the Sigma if I had not tried the Canon. The Canon is a bit warmer and more vibrant but the reds are a bit too saturated.

Resistance to flare was excellent with both lenses. AF was not a problem with either. The Canon is a bit smaller but probably not lighter.

Oh duh I totally forgot about the Samyang/Rokinon/Bower 14mm f/2.8. It's a super sharp lens, and although it does have it's faults (distortion is pretty bad but fixable in post), you can't really be too picky at $399. I'd say it's definitely worth a shot, especially if you're on a budget.

Oh duh I totally forgot about the Samyang/Rokinon/Bower 14mm f/2.8. It's a super sharp lens, and although it does have it's faults (distortion is pretty bad but fixable in post), you can't really be too picky at $399. I'd say it's definitely worth a shot, especially if you're on a budget.

+1

Also, I see the lens drop as low as $300 every once in a while. At that price, it is too good to pass up!